Surface plate for wheel lathes



Aug. 20, 1929. E. BLAU SURFACE PLATE FOR WHEEL LATHES Original FiledFeb. 28. 1928 Patented Aug. 20, 1929.

UNITED. STATES 1,725,331 PATENT OFFICE.

ERNST BLAU, OF BERLIN, GERMANY.

SURFACE PLATE FOR WHEEL LATHES.

- Original application filed February 28, 1928, Serial No. 257,742, andin Germany November 28, 1925.

Divided and this application filed The present invention relates tosurface plates for wheel lathcs and particularly to lathes of the typein which jaws are provided for engaging the tire or IlIIl of a drivenwheel on the inside, as differentiated from lathes of the type providedwith drivers for engaging the spokes of the wheel or holes in the wheelcenter. This application is a division of my application Serial No.257,742 for Surface plates for wheel lathes which was filed on February28, 1928.

One of the objects of the invention is the provision of means forequalizing the pressure which the jaws exert on the tire or the rim, asthe case may be, and for this purpose I provide the usual surface platewith a movable support upon which the jaws are movably carried, thesupport acting to effect uniform distribution of pressure on all of thejaws when the reaction of the cuttrng tool causes one of the jaws toexert an 1ncrease of pressure against the work.

It has previously been proposed to provide jaws for engaging the outerend faces of the tires of the driven wheels but this involves thedrawback that unequal axial pressure of the jaws is apt to deform orotherwise unduly strain the wheels and axles. In this connection, jawsfor engaging thevinner periphery of a tire have been pivoted directly onthe face plate without being provided with means for effecting uniformpressure distribution. Such jaws often cause the tires to become looseon the rims for if one jaw exerts a pressure appreciably greater thanthat of the remaining jaws upon the tire or rim, dangerous deformatlonof the tire may result. This is particularly true when the tire has beenworn to the extent-that its cross-section is below normal size.

April 12, 1929. Serial No. 354,610.

work while the other jaw is entirely out of engagement. 7

These difiiculties are overcome in my invention, by the provision of amovable support for the jaws, the jaws thereby being in floatingrelation with respect to each other and the tire.

These and other objects of the invention will become more readilyapparent upon a study of the following specification when read inconnection with the accompanying drawings and appended claims.

In the drawing, Fig. 1 is a section of a part of a wheelcenter showingone jaw engaged with the rim.

Figs. 2 and 3 are a front and an end elevation, respectively, of amodification of my invention in which two jaws are used.

Figure 4 is a front elevation of a further modification in which threejaws are used.

1 is the surface plate of a wheel lathe, not shown, and 2 is a groove orslot provided on the face of the plate 1 for the reception of blocks. 3,the blocks 3 being fixed during the rotation of the surface plate butadjustably secured thereto so as to be capable of change of position forvarious sizes of work. Mounted on each of the blocks 3 are pivots 4which support double armed levers 5. .Corres ponding ends of the doublearmed levers 5 are pivotally connected to an adjustable link 6 whichcomprises a threaded sleeve 7 engaging the oppositely threaded ends ofrods 8.

In Fig. 2, eccentric jaws 9 are pivoted to each of the double armedlevers 5 for engagement with the rim 10 of a wheel 11 as shown inFig. 1. When one of the jaws is caused to exert an increase in pressurebecause of the engagement of the tool with the work, that jaw will havea tendency to move toward the center of rotation and the other jaw willhave a tendency to move away from the center of rotation due to theaction of levers 5 and link 6. Thus the reactions between each jaw andthe work must always be equal and a condition in which unequal pressuresare exerted by the jaws cannot exist.

In Fig. 4, av double armed lever 12 is fulcrumed to an end of one of thedouble armed levers 5. Eccentric Work driving jaws are pivotallyconnected to the ends of the lever 12 and this modification alsoprovides a construction wherein the pressure upon all of no the jawsmust be equal in order to have the supporting means in equilibrium.

'Having thus described my invention, what I now claim as new and desireto secure by Letters Patent of the United States is as follows:

1. A surface plate for wheel lathes, a pair ofidouble armed leversfulcrumed thereto, a link pivotally connected to each of said levers,and eccentric jaws pivotally carried by said levers, said link and saidjaw connections being on opposite sides of the fulcrum. i 1

2. A surface plate for wheel latl1es, a pair of blocks mounted thereon,double armed levers fulcrumed on said blocks, a link pivotally connectedto each of said levers, and eccentric jaws pivotally carried by saidlevers, said link and said jaw connections being on'opposite sides ofthe fulcrum.

3. A surface plate for wheel lathes, a pair of blocks adjustably mountedon said surface plate, double armed levers fulcrumed on said blocks,eccentric jaws carried by said levers, and a link connecting saidlevers, said link being adjustable in length, said link and said jawconnections being on opposite sides of the fulcrum. 4. A surface platefor wheel lathes provided with a slot extending transversely across itsface, a pair of blocks mounted in said slot and adjustably secured tosaid face plate, double armed levers fulcrumed on said blocks, eccentricjaws carried by said levers, and a link pivotally connected to each ofsaid levers, said link being adjustable as to length, said link and saidjaw connections being on opposite sides of the fulcrum.

r 5. A surface plate for wheel lathes, a pair of double armed leversfulcrumed thereto, a link pivotally connected to each of said levers,and eccentric jaws'pivotally carried by said levers, said jaws beingcarried by said levers at points substantially diametrically opposedwithrespect to the center of rotation of the surface plate, said link andsaid jaw connections being on opposite sides of the fulcrum.

6. A surface plate for wheel lathes, a pair of double armed leversfulcrumed theretc, a link pivotally connected to each of said levers, athird double armed lever pivotally carried by one of the aforesaidlevers at a point opposite the fulcrum with respect to the linkconnection, eccentric driving jaws pivotally carried thereby, and aneccentric jaw carried by the other of the first mentioned double armedlevers, at a point opposite the fulcrum with respect to the linkconnection. 7

'7. A surface plate for wheel lathes, a pair of blocks adjustablysecured thereto, a double armed lever fulcrumed on each block a thirddouble armed lever pivotally carried by one of the aforesaid fulcruinedlevers, an eccentric jaw pivotally carried at each end of the aforesaidpivotallycarriedlever, an eccentric jaw pivotally carried by the otherfulcrumed lever, and a link pivotally connected to each of saidfulcrumed levers, said link being adjustable in length, said linkconnections being on opposite sides of the fulcrums with respect to theconnections with the said third double armed lever and the jaw carriedby the said other fulcrumed lever.

In testimony whereof, I have hereunto set my signature. Y

' ERNST BLAU.

